O_2/N_2、O_2/CO_2和O_2/CO_2/NO气氛下煤粉燃烧NO_x排放特性  

NO_x emission characteristics of pulverized coal combustion in O_2/N_2,O_2/CO_2 and O_2/CO_2/NO atmospheres

作　　者：张永春[1] 张军[1] 盛昌栋[1] 赵亮[1] 谢芳[1] 陈洁[1] 刘杨先[1] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《化工学报》2010年第1期159-165,共7页CIESC Journal

基　　金：国家自然科学基金国际合作交流项目(507211460649);华中科技大学煤燃烧国家重点实验室开放基金(200502)~~

摘　　要：利用滴管炉研究了O2/N2、O2/CO2和O2/CO2/NO气氛下煤燃烧过程中NOx的排放特性。实验结果表明,在O2/N2和O2/CO2气氛下,高温或高O2浓度均使NO排放量增加。O2/CO2气氛下NO排放量比O2/N2气氛下NO排放量低大约30%-40%。在O2/CO2/NO气氛下,温度不同时,O2浓度变化对NO排放量的影响规律不同,对循环NO降解的影响规律也不同。高温不利于循环NO降解。随停留时间的延长NO排放量出现两个峰值。NOx emission characteristics during pulverized coal combustion in O2/CO2, O2/N2 and O2/CO2/ NO atmospheres were studied by using a drop tube furnace. The results showed that in the O2/N2, atmosphere NO emission increased with the increase of O2 concentration or temperature. The same tendency of NOx emission was also found in the O2/CO2 atmosphere. However, the NOx emission in the O2/CO2 atmosphere was 30%- 40% lower than that in the O2/N2 atmosphere. In the O2/CO2/NO atmosphere, the effects of O2 concentration on NO,, emission as well as on recycled-NO reduction were different at different temperatures. High temperature did not favor recycled-NO reduction. There were two peak values of NOx emission with the increase of residence time.

关 键 词：O2/CO2气氛 煤粉燃烧 NOX排放 循环NO 

分 类 号：TQ534.9[化学工程—煤化学工程]